Date

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Measurement of gamma gamma ---> p anti-p production at Belle

The Belle collaboration Kuo, Chen-Cheng ; Abe, K. ; Adachi, I. ; et al.
Phys.Lett. B621 (2005) 41-55, 2005.
Inspire Record 677625 DOI 10.17182/hepdata.50303

A high precision study of the process gamma gamma -> p p-bar has been performed using a data sample of 89/fb collected with the Belle detector at the KEKB e+e- collider. The cross section of p p-bar production has been measured at two-photon center-of-mass (c.m.) energies between 2.025 and 4.0 GeV and in the c.m. angular range of |cos(theta^*)|<0.6. Production of gamma gamma -> eta_c -> p p-bar is observed and the product of the two-photon width of the eta_c and its branching ratio to p p-bar is determined.

6 data tables

Measured cross section for GAMMA GAMMA --> PBAR P in the angular region ABS(COS(THETA)) < 0.6.

Measured differential cross sections versus COS(THETA) for the W ranges 2.075 to 2.5, 2.5 to 3.0 and 3.0 to 4.0 GeV.

Measured differential cross sections versus COS(THETA) for the W ranges 2.075 to 2.1, 2.1 to 2.2 and 2.2 to 2.3 GeV.

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Measurement of the cross-section for the process gamma gamma ---> p anti-p at s(e e)**(1/2) = 183-GeV to 189-GeV at LEP

The OPAL collaboration
Eur.Phys.J. C28 (2003) 45-54, 2003.
Inspire Record 595836 DOI 10.17182/hepdata.48881

The exclusive production of proton-antiproton pairs in the collisions of two quasi-real photons had been studied using data taken at sqrt(s)_ee=183 GeV and 189 GeV with the OPAL detector at LEP. Results are presented for Ppbar invariant masses, W, in the range 2.15 W< <3.95 GeV. The cross-section measurements are compared with previous data and with recent analytic calculations based on the quark-diquark model.

3 data tables

Cross section as a function of the invariant mass of the pbar-p pair.

Cross section for two photon production of the pbar-p pair.

Angular distributions in 3 W ranges.


Measurement of the proton - anti-proton pair production from two photon collisions at TRISTAN

The VENUS collaboration Hamasaki, H. ; Abe, K. ; Amako, K. ; et al.
Phys.Lett. B407 (1997) 185-192, 1997.
Inspire Record 443677 DOI 10.17182/hepdata.38332
2 data tables

Numerical values supplied by Hirhoshi Hamasaki.

Angular distributions.


Measurement of cross-section for gamma gamma ---> p anti-p

The CLEO collaboration Artuso, M. ; He, D. ; Goldberg, M. ; et al.
Phys.Rev. D50 (1994) 5484-5490, 1994.
Inspire Record 358510 DOI 10.17182/hepdata.47137
3 data tables

Data read from graph.

Data read from graph.

Data read from graph.


Two Photon Production of Final States With a $p \bar{p}$ Pair

The ARGUS collaboration Albrecht, H. ; Bockmann, P. ; Glaser, R. ; et al.
Z.Phys. C42 (1989) 543, 1989.
Inspire Record 267759 DOI 10.17182/hepdata.15473

Two-photon production of the exclusive final statesp\(\bar p\)+nπ (n=0, 1, 2, and 3) has been investigated using the ARGUS detector at thee+e− storage ring DORIS II at DESY. The reactionsγγ→p\(\bar p\)π andγγ→p\(\bar p\)π+π−π0 have been observed for the first time, as have theΔ++ and\(\overline {\Delta ^{ ++ } } \) baryons in the final statep\(\bar p\)π+π−. No evidence was found forΔ++\(\overline {\Delta ^{ ++ } } \) production. Topological cross sections for two-photon production ofp\(\bar p\),p\(\bar p\)π0,p\(\bar p\)π+π− andp\(\bar p\)π+π−π0, as well as the crosssection forγγ→Δ++\(\bar p\)π+π−+c.c., have been measured. Upper limits are given for the cross section forγγ→Δ0\(\overline {\Delta ^0 } \),γγ→Δ++\(\overline {\Delta ^{ ++ } } \) andγγ→Λ\(\bar \Lambda \).

7 data tables

Data read from graph.. Additional overall systematic error 13% not included.

Data read from graph.. Additional overall systematic error 13% not included.

Data read from graph.. Additional overall systematic error 13% not included.

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Exclusive production of $p\bar{p}$ pairs in two photon collisions at PEP

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Avery, R.E. ; et al.
Phys.Rev. D36 (1987) 3506, 1987.
Inspire Record 246557 DOI 10.17182/hepdata.23356
3 data tables

Data read from graph in preprint. Statistical errors only.

Data read from graph. Statistical errors only.

Data read from graph. Statistical errors only.


THE TPC / 2 gamma EXPERIMENT AT PEP

Bauer, Daniel A. ;
Conference Paper, 1986.
Inspire Record 231357 DOI 10.17182/hepdata.76256
11 data tables

Data read off graph.

Data read off graph.

No description provided.

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Exclusive Production of Proton Anti-proton Pairs in Photon-photon Collisions

The JADE collaboration Bartel, W. ; Becker, L. ; Cords, D. ; et al.
Phys.Lett. B174 (1986) 350-356, 1986.
Inspire Record 231554 DOI 10.17182/hepdata.30246
2 data tables

Data read off graph.

Data read off graph.


Differential Cross-sections for $\gamma \gamma \to p \bar{p}$ in the Center-of-mass Energy Range From 2.0-{GeV} to 3.1-{GeV}

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Gather, K. ; et al.
Phys.Lett. B130 (1983) 449-453, 1983.
Inspire Record 191417 DOI 10.17182/hepdata.6654
5 data tables

No description provided.

No description provided.

UPPER LIMIT FOR THE PRODUCT OF THE ETA/C --> GAMMA GAMMA WIDTH AND THE BRANCHING RATIO OF ETA/C --> P AP IS DETERMINED TO BE 0.32 KEV WITH 90 PCT CL.

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Exclusive Production of Hadron Pairs at Large Momentum Transfer in Photon-photon Interactions

The PLUTO collaboration Berger, Christoph ; Deuter, A. ; Genzel, H. ; et al.
Phys.Lett. B137 (1984) 267-271, 1984.
Inspire Record 194772 DOI 10.17182/hepdata.30576
3 data tables

THIS METHOD OF ANALYSIS OF THE OBSERVED RATIO OF HADRON TO MUON PAIRS, IS TIED TO THE SPECIFIC DETECTOR ACCEPTANCE, BUT HAS THE ADVANTAGE OF BEING VIRTUALLY INDEPENDENT OF THE HADRON MASSES.

SEE COMMENT IN PREVIOUS TABLE.

THIS METHOD OF ANALYSIS OF THE CROSS SECTION AT 90 DEG IN THE CM AS A FUNCTION OF PCM IS MORE EASILY COMPARED WITH THEORETICAL PREDICTIONS BUT MORE DEPENDENT ON THE SPECIFIC HADRON MASSES.